LATEST: The reason behind Brad Pitt and Jennifer Aniston's separation remains unclear, with at least three different theories for the split being put forward - two of which involve Angelina Jolie.

Pitt publicist Cindy Guagenti issued a statement on behalf of the couple on Friday (07JAN05), in which it was announced they have officially separated after four and a half years of marriage.

The most common reason being given for the split is that the couple argued over whether or not to have children.

Pitt, 41, is reportedly keen to become a father while former FRIENDS star Aniston is said to want to concentrate on her movie career.

Another theory is that Aniston, 34, heard Pitt and his MR + MRS SMITH co-star Jolie engaging in 'phone sex'.

A source tells British newspaper the NEWS OF THE WORLD, "(Brad and Angelina) would speak on the phone all the time - always speaking in hushed tones. There was no hiding their affection for each other.

"Jennifer listened in on the conversation via another extension. I don't know if she accidentally picked up the phone or deliberately did that. Either way, she went ballistic."

And, in a further explanation involving sexy TOMB RAIDER star Jolie, UK tabloid the DAILY STAR SUNDAY writes that the marriage finally collapsed because Pitt adores playing father to Jolie's adopted son, MADDOX.

An insider tells the publication, "Jen became furious when he pointed out that, at 29, Angelina is six years younger than her and is managing to combine motherhood and a successful career."

09/01/2005 14:51